Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '800c7fc1b8b11e34c9385bf3520b15e0434d794c53d3a2035225f81ac11c9a97' 
  AND token = 'ysmn3X80OENbq5t6KMiNzOdTT3mDbylViqR+KOgDuwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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