SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acfe355e7864cc1b8f261ad268e8eeacbd1fa3df6e2c90a0c9e964250978842e' 
  AND token = 'hvBYoHKE4TA6ssOtHxdZnVtaO+xQMXFm7w7n3L1gmls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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