SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a3f788383d6c2bbe87df2036c18c4b81d27bd2c9531383ca93568b4547283c8' 
  AND token = 'DEvaOuGuoZgcz5DjaqXs1R3Jgkt85BdJn4RT/YOJhsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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