Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99ba2b71f58f18ce76b3e7e2a1037b12debf1794e0b681966f3828cc9ab76e1' 
  AND token = 'I9CidNcHjLGEOqmqu3Q3Ae/VIgIDedqIzcwNlPsQxaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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