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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a16c442c96d8942711e4c9caf96e9af66030d9d6e08a13601ec286f91ff6d3a' 
  AND token = 'hYzmOtCjl3OYcolIt6Iu4z56IBc9TYFS/YtOVDBdkZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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