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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdaec16af4ea7f0b5a77b11d1a31fd85bbf11da1a396957ac385010b18bf83ba' 
  AND token = 'nZKlmQczdd24jhp3ivdNay/qHCgb2ZijYFc5JHWjfIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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