SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f143fe649f501b4ba7d7e6509d0f3aa2fc917cb4cd671fb253122b4bce0590a0' 
  AND token = 'glMn5QYkTe+m98qC5mY8pb7vqsu5/2eSeX9IvbuVGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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