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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '539e1e8f3b6d05f0283692d530c7a8a6a038f9101661fb7fd37a65da96d0f71e' 
  AND token = 'JXWh5NNwVqv7ZTrurnUa3F99kuMyZ95XVOaEq40+cqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}