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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10f62abab16b6f7bd2f1df411ecc1dd406b944ba1c820a833b8438d687b4ac67' 
  AND token = 'F/C7NHO2u2xPy0A31cbGNBsl6GR9ZInXqjTn3wqUiz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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