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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9395065d3a567c1ee07dd01727c336d05c861144c9d66ad8c596f531ae899343' 
  AND token = '1sSKXJSUjbwPwW7xDN554PhsParPqsvstOE4vDV6nuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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