SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36ddc7f53f8e05d2fbb1627b3c34141e4245b5c4c1568310bbed8ddd5e6f5ffc' 
  AND token = 'nVLponbhsGmymyYQXUIc9Ky0VwKEqUxKwwfzu+vDQl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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