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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57727a63f679785e3ceb19361fdb3e1d2fc6248de2c771f91b834e55a3de9334' 
  AND token = 'PToWl/Hwgx0feKNZ5EIwjR4StgXLaHirGFyRzK3Sakg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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