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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cb3108b98e400c394ffb960599dbde9814075de0970c10cff5cefbcf072ad86' 
  AND token = '5fvHH4gTcEzees6CwQ4afJKB3uUaWN4Eq3Gy79yNcnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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