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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45a50c6241f82ac392023d8566c8f9570034ee55bfec104ad29f1b817da9ee2d' 
  AND token = 'lKOItm9XRfzZunQn0/7qgPW5DP84MqqyTIWssT8y9tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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