SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '697c4812acd8de056bf91ebd26f22258616ba6d023c84bc4390490afa6243a61' 
  AND token = 'EjWsyG+cPXkT8Jp7lfglkn5qMxyYBL7SI7GgZxYv57I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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