Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7671911e6a9f0b423fa10798172cb9ba92cc0dbffcf7ac92ab5ed4c233b2186' 
  AND token = 'jxmmbWzqInCeAiXcgGuwxQ6zrlp7IUnttmld3NIH5zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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