SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15314534db7ee161f023671ad337bff9428672e71c9ffc1d2d88df3997fb0dcb' 
  AND token = 'YuPel+L/KzsUSNrzJ7Va7W0BjD+83J3WaMyIFV7oPcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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