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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90e8ba51d057675cf69cad1489be24c83d40da3a5c50bbea26cdb1842439c299' 
  AND token = 'dxI1bsfZqqcL4qP8ifIxU5tSO7qhZVHlfcrFtA9z/fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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