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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '723e44bf2068eb0102dd3c3c9cc0be3d522f3e0bfada45600dd543f940e35017' 
  AND token = 'bkFtBD6mEHPooAbHvo0D4LyZE3LeiP742EJSq8ASWNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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