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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '478e5971c6247199b30fa3f9a873f307593c62160fde1e1f256791ad6995d970' 
  AND token = 'OL7GnNFvPMJkt7sWrOAP11H4weLagrcjz8RPFyvMUPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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