SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01501e41b8b06d23ee0c367e878d691a602e5aff5a75e8b2a6f3424bfd767967' 
  AND token = '2//nDMZu/55lg+PMXrQXiOXFgKCqekG9PopmBBWLbUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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