SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d3a1ff393691b4e7d852211e28934b4dd02bdace1bb369d83f7f500e2cfa467' 
  AND token = 'zwjK9sKLH+B8moOFynhWCIT2/d9qeSeYNli3yIw/uqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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