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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '733a59dca01df763b2f070310fb7e3fbe5066ebc107fc7eb7e1c85af0a886d3a' 
  AND token = 'oaUcs8ch7i4oyCS8hQEUTz5XIptFzsM1QWkZtHiFVk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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