Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc83a5b3c34d9f1fc54c4eb04c4dae601b07d2580db41d1fb9f5c40fea2c8f84' 
  AND token = 'KLB+5txGTAxF7r1pk1qYoiMn8yAQnQwLioDu4ExWMaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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