Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fefa7d6c875d166606463e0012d0d178e1a27df5c12bd52a19a19d5fb2bf6227' 
  AND token = 'tGM82Bni5Y+Kv9DeOtD7OSQQnwrBADZ9sVOPhAeGaTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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