SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f77209666d9faba83185cea1139fa0faa648cb12d49fbd5249ac6981430672dd' 
  AND token = 'QJ307vYqTQDCkZs8rYH70gshW6/NED4hyFZdRsBDgN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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