SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a96028969124006e6548ce9e183a07bf3ebfdc7cdd3319f5d06f3cc12c12ad1d' 
  AND token = 'aXzhLB5axkDd/37cixZfJLS9Uho3vSlmVuSqlhP+0PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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