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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c4a9dc39c879f47d2d88037c7c909551206a719fd5c537ac6039eba27603650' 
  AND token = 'Qb7VHaX8Qjdo9R9MFOXCak7CmZbziZQ+dxt/uDKVTGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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