SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab4c36395bfa4860b67464aa0120f965b533ac70f22240052bfd5302e7d46ac2' 
  AND token = 'qrXTMRG4e7BJ/QL/km/hBH921POJ5RtGVlzASm6BXAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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