SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8978702d200287a4fa702677ce6c73c817631ab43bc24ec9d08b5459b6edc08f' 
  AND token = 'Lz3cyJEl1KjSMSIDSrsoVhmrWTXqHO9+fRXYS2sS4GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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