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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc43d0c5120f29b56019a611545233e842b5a4434fcffe5eb9f7a849f0e34d8' 
  AND token = 'zxuoAxeT+UOluKgbK5XExIRIrVArRWi/9sQPCUiKckI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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