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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2ad57d3acc29ab1c098417b9be941fe7375950ffdd9f2328650840f0279e6ef' 
  AND token = 'w4HPAn0caRJoyln/iJMMpT+NVwsfBpFXFiUd4EtsY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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