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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a36b08e6fecebc91e1844d2fa9db0e93cc0b7f4787b99bb2b9c1238af1e41c4' 
  AND token = 'G0CPEl3x5jqtocXWEgjoH200lleVaH++7WsIoBr4LKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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