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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e90b9600ebff8918386bf55b73afc0138cb818a4a5b69126e6e511240d753fd' 
  AND token = 'vECmk2b8wtAxg8RshdH6VcbrmQ+IyRb86+HHN8n6mxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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