SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1cd689de8d36b7ea1e2496825c3356f8a4bbbd9248dcc0317085f3312ad4b5d' 
  AND token = 'yGaRoxUTmHLxvZyObkRnUZUZ6d5lwwfjYlYXK4e/ClM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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