Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc8e5b2f766caadc1581d38b93d11e24a41dc2a98abd58e5f88418cfe7d0cdf2' 
  AND token = 'p8C2pRW3Itgc+ieeebTLVd9COGLyDU4QhHz8JIJ/5Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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