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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e5981cf7a80db074853653634f2b4c0b528b1c9892e647250c6ae70c2c4a0d4' 
  AND token = 'EY9cspTVqxiyOn8FTN0ulo6ly8D2HOpbLqQS/4lvois=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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