SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b90593d3defd6224803a4254ea72f20e5b5bb238acf2b1ec84df39c8b55bc213' 
  AND token = '64vEwRIIEqBejK/i/2EasYIkNW6oStOfXh+5GCJ0FHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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