Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c5fab6552c38cb1f1b1c9a0db0e8d917d65f0c4f014ad590d66b6e1f1dc5bae' 
  AND token = 'K+8hSEjQtrfjRjc2WR4vUjboPIKi/k8IxkWc0qM4sfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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