SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fe5ba7dd8dd93905f0b3e184646ab650281e6a246b26ee6f7ce594635cd5c89' 
  AND token = 'dE9FbKDpJjl1vJ7qgvZuhAWNDeBACaz5lrtoks2rngQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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