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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fcdb19755287b29f92f2849a180d104ac510408de327d0ed3043a05cd395897' 
  AND token = 'un1hQraNk1aHzAt1NbddfsZo97P6sXD2CSQ5FzYspAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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