SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2eceb4722994269b4e778305f697c6606fc7b99aa7630e8b5396b1aa15e7ba9' 
  AND token = 'kzEUr4R2A7+QjHP4AdUwzir0EAgh/gTJXYVD6wf/Jbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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